Manufacturing method of ethyl ethyl cyanoacetate
I. INTRODUCTION
Ethyl ethyl cyanoacetate is an important organic chemical raw material, which is widely used in the production of pharmaceuticals, pesticides, dyes and other industries. Mastering the manufacturing method of ethyl cyanoacetate is of great significance to improve the production efficiency, reduce the cost and enhance the product quality. This article will introduce the manufacturing method of ethyl ethyl cyanoacetate in detail, including raw material preparation, reaction process, post-treatment and precautions.
II. Raw material preparation
1. Cyanoacetic acid: Cyanoacetic acid is the main raw material for the preparation of ethyl ethyl cyanoacetate, which should have high purity to avoid the influence of impurities on the reaction.
2. Ethanol: ethanol is used as solvent and reactant, industrial grade ethanol with high purity should be used.
3. Catalyst: Sulfuric acid is usually chosen as the catalyst, which can improve the reaction rate.
3. Reaction process
1. Add cyanoacetic acid and ethanol into the reactor in a certain proportion and stir well.
2. Under stirring, slowly add catalyst sulfuric acid and continue stirring for a certain period of time to make the reaction proceed fully.
3. The temperature is controlled during the reaction, and the reaction is usually carried out in the range of 60-80℃.
4. At the end of the reaction, static layering is carried out to separate out the unreacted ethanol and water.
4. Post-treatment
1. The reaction solution was distilled to collect the ethyl ethyl cyanoacetate fraction.
2. Refine the collected ethyl ethyl cyanoacetate to remove impurities and improve product purity.
V. Precautions
1. Strictly observe the safety operation procedures during operation to avoid leakage, splashing and other safety accidents.
2. The amount of catalyst sulfuric acid added should be appropriate, too much will lead to equipment corrosion, too little may affect the reaction rate.
3. Control the reaction temperature to avoid the effect of too high or too low on the reaction.
4. In the post-treatment process, it should be ensured that the product quality meets the relevant standards to avoid the influence of impurities on downstream products.
VI.CONCLUSION
Ethyl ethyl cyanoacetate can be effectively prepared by the manufacturing method introduced in this paper. In the actual production process, the process parameters should be flexibly adjusted according to the specific conditions and requirements in order to improve the production efficiency, reduce the cost and improve the product quality. At the same time, safety management and environmental protection measures should be strengthened to ensure the safety and sustainability of the production process. In conclusion, mastering the manufacturing method of ethyl ethyl cyanoacetate is of great significance in promoting the development of the chemical production field.
